chore(package): update mocha to version 7.1.0

Closes #7

Author: greenkeeper[bot]

package.json

@@ -29,7 +29,7 @@
   "devDependencies": {
     "binding": "^3.0.3",
     "bindings": "~1.3.0",
-    "mocha": "^5.0.0",
+    "mocha": "^7.1.0",
     "nan": "^2.8.0",
     "nyc": "^12.0.1",
     "ref-array": "^1.2.0",